Polio, although it is eradicated in the United States, it continues elsewhere and is able to be brought into the country by visitors.
Polio, although it is eradicated in the United States, it continues elsewhere and is able to be
Polio, although eradicated in the United States, it still continues elsewhere and can be
Although still continuing elsewhere, polio has been eradicated in the United States and could be
Although having been eradicated in the United States, polio still continues elsewhere and is capable of being
Although eradicated in the United States, polio continues elsewhere and could be
A,B都有polio和it两个主语,it多余
C主从句逻辑有误,应该是虽然P被根除,但是P还是有可能白带进美国
D 虽然P一直正在被根除,但是P仍然还在其他地方继续并且有能力被游客带进美国,
E虽然P被根除,但是P还在其他地方继续并且可能被游客带进美国
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